高铅渣物理化学性能测定的偏差规律

Deviation prediction on physicochemical properties of high-lead slag

为探明造成高铅渣物理化学性能测定中实际值与理论值偏差的原因,本研究配制了Pb O-Fe Ox-Ca OSi O_2-Zn O系渣。利用TG-DSC热重差热分析仪分析了不同组分含量熔渣的失重变化规律,采用FACTSage软件计算炉渣熔点、粘度,并与实验测定结果进行了对比,分析了性能偏差规律。研究结果表明,对w(Pb O)=20%~40%的中、高铅渣,熔渣在736~1 450℃时铅的挥发率大约15%~16%;当w(Fe O)/w(Si O_2)设置在1.29~2.05和w(Ca O)/w(Si O_2)=0.40时,实际测定的渣熔点与炉渣挥发后理论熔点之间的偏差(ΔT_(a-vv))介于+34^+190℃,实测粘度与理论粘度偏差(Δη_(a-vv))介于+0.17~0.32 Pa·s;而w(Ca O)/w(Si O_2)=0.80时,ΔTa-vi值较小,介于+3^+92℃,实测值更接近理论值。依据不同熔渣组分在给定温度下的挥发规律以及ΔT_(a-vv)和Δη_(a-vv)偏差结果,可以对给定的初始渣组分的实际熔点及粘度值进行预测,并可根据实测值来预测可能的渣组分。

Different composition of Pb O-Fe Ox-Ca O-Si O2-Zn O slags were prepared in this research in order to find out the main deviation reasons between measured and theoretical value of physicochemical properties for high lead slag. Theoretical melting temperature and viscosity of lead slags were calculated with FACTSage software,compared with slag experimental data. In addition,weight loss rate for different content slag were analyzed by TG-DSC thermal differential thermal analyzer to predict the deviation of physicochemical properties. The results show that volatile loss rate of lead slag reached up to 15%16% at the temperature of 736 ℃to 1 450 ℃ when w（Pb O） content of high lead slag were between 20% to 43%; When the ratio of w（Fe O）/w（Si O2） were between 1.29 and 2.05 and the ratio of w（Ca O）/w（Si O2） at 0.40,the deviation between the experimental melting temperature and the volatile theoretical value（ ΔTa- v）were about ＋34 ℃ to ＋190 ℃,viscosity deviation（ Δηa- v）were about 0.17 to 0.32 Pa·s; Furthermore,when w（Ca O）/w（Si O2） was set at0.80,the ΔTa- vvalue were low as ＋3℃ to ＋92℃. According to the ΔTa- v,Δηa- vdeviation values at different slag compositions at given temperatures,actual melting point and viscosity were able to be predicted with given initial slag composition and the actual slag compositions were also able to be deduced according to the observed physicochemical properties.